Analysis of Diesel Engine In-Cylinder Air-Fuel Mixing with Homogeneity Factor: Combined Effects of Pilot Injection Strategies and Air Motion

TY - JOUR

T1 - Analysis of Diesel Engine In-Cylinder Air-Fuel Mixing with Homogeneity Factor

T2 - Combined Effects of Pilot Injection Strategies and Air Motion

AU - Dimitriou, Pavlos

AU - Wang, Weiji

AU - Peng, Jun

AU - Cheng, Li

AU - Wellers, Matthias

AU - Gao, Bo

N1 - Publisher Copyright: © 2014 SAE International.

PY - 2014/10/1

Y1 - 2014/10/1

N2 - With a view to understanding the air-fuel mixing behavior and the effects of the mixture quality on the emissions formation and engine performance, a new quantitative factor of the in-cylinder air-fuel homogeneity named Homogeneity Factor (HF) has been developed. Its characteristics under various injection conditions and air swirl motions within the cylinder have been investigated with CFD simulation. The results have shown that air-fuel homogeneity is essentially affected by the spatial and temporal fuel distribution within the combustion chamber. Higher injection pressure, longer dwell time and increased pilot fuel quantities can contribute to better mixing quality resulting in increased HF and optimum engine performance with low fuel consumption and soot emissions. With regard to the in-cylinder air motion, increasing swirl ratio enhances the air-fuel mixing quality which has been reflected in the variation of the HF. As a result, increased in-cylinder pressure and temperature caused by the optimized air-fuel mixing improved the combustion efficiency.

AB - With a view to understanding the air-fuel mixing behavior and the effects of the mixture quality on the emissions formation and engine performance, a new quantitative factor of the in-cylinder air-fuel homogeneity named Homogeneity Factor (HF) has been developed. Its characteristics under various injection conditions and air swirl motions within the cylinder have been investigated with CFD simulation. The results have shown that air-fuel homogeneity is essentially affected by the spatial and temporal fuel distribution within the combustion chamber. Higher injection pressure, longer dwell time and increased pilot fuel quantities can contribute to better mixing quality resulting in increased HF and optimum engine performance with low fuel consumption and soot emissions. With regard to the in-cylinder air motion, increasing swirl ratio enhances the air-fuel mixing quality which has been reflected in the variation of the HF. As a result, increased in-cylinder pressure and temperature caused by the optimized air-fuel mixing improved the combustion efficiency.

UR - http://www.scopus.com/inward/record.url?scp=84953847575&partnerID=8YFLogxK

U2 - 10.4271/2014-01-9052

DO - 10.4271/2014-01-9052

M3 - 文章

AN - SCOPUS:84953847575

SN - 1946-3936

VL - 7

SP - 2045

EP - 2060

JO - SAE International Journal of Engines

JF - SAE International Journal of Engines

IS - 4

ER -